#region Copyright(c) Anton Shelin, Vladimir Timashkov. All Rights Reserved.
// -----------------------------------------------------------------------------
// Copyright(c) 2010 Anton Shelin, Vladimir Timashkov. All Rights Reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   1. No Trademark License - Microsoft Public License (Ms-PL) does not grant you rights to use
//      authors names, logos, or trademarks.
//   2. If you distribute any portion of the software, you must retain all copyright,
//      patent, trademark, and attribution notices that are present in the software.
//   3. If you distribute any portion of the software in source code form, you may do
//      so only under this license by including a complete copy of Microsoft Public License (Ms-PL)
//      with your distribution. If you distribute any portion of the software in compiled
//      or object code form, you may only do so under a license that complies with
//      Microsoft Public License (Ms-PL).
//   4. The names of the authors may not be used to endorse or promote products
//      derived from this software without specific prior written permission.
//
// The software is licensed "as-is." You bear the risk of using it. The authors
// give no express warranties, guarantees or conditions. You may have additional consumer
// rights under your local laws which this license cannot change. To the extent permitted
// under your local laws, the authors exclude the implied warranties of merchantability,
// fitness for a particular purpose and non-infringement.
// -----------------------------------------------------------------------------
#endregion

using SharpDom.Attributes;

namespace SharpDom
{
    /// <summary>Language codes. It contains natural language code recognizable by user agent.
    /// Source - http://w3schools.com/tags/att_meta_name.asp </summary>
    /// <example>refresh</example>
    public sealed class MetaName : AttributeValue<string>
    {
        /// <summary>Closed constructor</summary>
        private MetaName() { }

        /// <summary>Converts string to HEADER NAME</summary>
        /// <param name="value">String to convert</param>
        /// <returns>Created header name</returns>
        public static implicit operator MetaName(string value)
        {
            if (string.IsNullOrEmpty(value)) return null;
            return new MetaName { BaseValue = value };
        }

        /// <summary>Defines the author of the document</summary>
        public static MetaName author { get { return new MetaName { BaseValue = "author" }; } }
        /// <summary>Defines copyright information of the document</summary>
        public static MetaName copyright { get { return new MetaName { BaseValue = "copyright" }; } }
        /// <summary>Defines a description of the document</summary>
        public static MetaName description { get { return new MetaName { BaseValue = "description" }; } }
        /// <summary>Defines the distribution level of the document (like "Global")</summary>
        public static MetaName distribution { get { return new MetaName { BaseValue = "distribution" }; } }
        /// <summary>Defines the program used to generate the document</summary>
        public static MetaName generator { get { return new MetaName { BaseValue = "generator" }; } }
        /// <summary>Defines keywords to describe the document</summary>
        public static MetaName keywords { get { return new MetaName { BaseValue = "keywords" }; } }
        /// <summary>Defines the id of a program used to generate the document</summary>
        public static MetaName progid { get { return new MetaName { BaseValue = "progid" }; } }
        /// <summary>Defines webpage rating</summary>
        public static MetaName rating { get { return new MetaName { BaseValue = "rating" }; } }
        /// <summary>Defines the type of the web resource</summary>
        public static MetaName resource_type { get { return new MetaName { BaseValue = "resource-type" }; } }
        /// <summary>Defines the expected update rate of the web resource</summary>
        public static MetaName revisit_after { get { return new MetaName { BaseValue = "revisit-after" }; } }
        /// <summary>Defines rules for robots (web crawlers for search engines)</summary>
        public static MetaName robots { get { return new MetaName { BaseValue = "robots" }; } }
    }
}